Remove width trick to use clear rect, fix #280

lib/torque/renderer/point.js

@@ -57,7 +57,7 @@ var Filters = require('./torque_filters');
     this.TILE_SIZE = 256;
     this._style = null;
     this._gradients = {};
-    
+
     this._forcePoints = false;
   }
 
@@ -68,7 +68,10 @@ var Filters = require('./torque_filters');
       var color = this._Map['-torque-clear-color']
       // shortcut for the default value
       if (color  === "rgba(255, 255, 255, 0)" || !color) {
-        this._canvas.width = this._canvas.width;
+        this._ctx.save();
+        this._ctx.setTransform(1, 0, 0, 1, 0, 0);
+        this._ctx.clearRect(0, 0, canvas.width, canvas.height);
+        this._ctx.restore();
       } else {
         var ctx = this._ctx;
         ctx.setTransform(1, 0, 0, 1, 0, 0);
@@ -165,7 +168,7 @@ var Filters = require('./torque_filters');
         i.src = canvas.toDataURL();
         return i;
       }
-      
+
       return canvas;
     },
 
@@ -193,7 +196,7 @@ var Filters = require('./torque_filters');
           }
         }
       }
-      
+
       prof.end(true);
 
       return callback && callback(null);
@@ -237,7 +240,7 @@ var Filters = require('./torque_filters');
     },
 
     //
-    // renders a tile in the canvas for key defined in 
+    // renders a tile in the canvas for key defined in
     // the torque tile
     //
     _renderTile: function(tile, key, frame_offset, sprites, shader, shaderVars) {
@@ -274,7 +277,7 @@ var Filters = require('./torque_filters');
           }
         }
       }
-      
+
 
       prof.end(true);
     },
@@ -425,7 +428,7 @@ var Filters = require('./torque_filters');
           }
           gradient = {};
           var colorize = this._style['image-filters'].args;
-          
+
           var increment = 1/colorize.length;
           for (var i = 0; i < colorize.length; i++){
             var key = increment * i + increment;